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Across 4. ___________ rock forms when magma, lava, or pyroclastic material cools and solidifies (Fact 104) 7. the four outer planets (gas giants) are Jupiter, ________, Uranus, and Neptune (Fact 56) 9. the four inner or terrestrial planets are Mercury, Venus, Earth, and _______ (Fact 33) 10. ________ is a chemical property and describes when two or more substances interact with each other and a chemical reaction has taken place (Fact 228) 12. the state of matter a substance is in depends on particle _______and particle attraction (Fact 234) 13. sedimentary rock forms in layers called __________ (Fact 106) 15. ________ and Venus are the only two planets that do not have any moons (Fact 39) 19. a ______ ___ __________ is a change that affects the physical properties of a substance;; a substance that undergoes this type of change is still the same substance (Fact 229) 22. an organism's ________ is its physical appearance (Fact 179) 23. the ________ part of an ecosystem is all the organisms that live together and interact with each other (Fact 143)

Down 1. the fourth state of matter is plasma and it is the most __________ state of matter in the universe (Fact 232) 2. the _____ ______ is the continual movement of water among Earth's atmosphere, oceans and land through evaporation, condensation, and precipitation (Fact 117) 3. ________ is a physical property that can be used to identify a substance; it is mass per unit volume (Fact 225) 5. an organism's _________ is its genetic material or allele combinations (Fact 180) 6. particles in a ______ can move close together or far apart, can break most of the attraction between them, and travel at high speeds (Fact 237) 8. moving particles make up all _______, these particles are attracted to each other (Fact 233) 11. a ___________ ___________ is a change that occurs when one or more substances is changed into entirely new substances with different properties (Fact 230) 13. _________ rocks forms when sediments (small pieces of material) are compacted or cemented together or when minerals crystallize out of oceans and lakes (Fact 105) 14. human beings have _____ _____ pairs of chromosomes (Fact 183) 15. ________ rock forms from the transformation of existing rock types due to heat or pressure (Fact 107) 16. particles in a _______ are closely packed together, strongly attracted to each other and vibrate in place (Fact 235) 17. particles in a ______are loosely connected, can break some of the attraction between them, and slide past each other (Fact 236) 18. the ________ of plants and animals are found in ___________ rock (Fact 105) 19. particles in a _________ are broken apart, electrically charged, travel at the highest speeds and are not affected by magnetic fields (Fact 238) 20. the ________ of an ecosystem includes all the nonliving components such as soil, water, light, and temperature (Fact 144) 21. the states (_________) of matter are the physical forms in which all substances can exist; the most familiar states of matter on Earth are solid, liquid, and gas (Fact 231)